Brake pedel pulses when pressed
#1
Brake pedel pulses when pressed
Hello,
I have an issue currently with the brakes on my 54' 88 HT. The brakes have been redone by the previous owner. The pedel just started to pulse "bounce" and I believe it to be vacuum related and not the hydraulic system. Any advise as to what it could be? Brakes are working well but this bounce just seemed to have started.
I have an issue currently with the brakes on my 54' 88 HT. The brakes have been redone by the previous owner. The pedel just started to pulse "bounce" and I believe it to be vacuum related and not the hydraulic system. Any advise as to what it could be? Brakes are working well but this bounce just seemed to have started.
#2
I always say "Check the simple stuff first".
And if this were mine I would take the drums off and have them turned, or checked, to make sure they are perfectly round. To me that is the simple thing to do.
If that was a waste then maybe someone else can think of something else to check.
I have seen many people "do" the brakes but not even do a half way job.
And if this were mine I would take the drums off and have them turned, or checked, to make sure they are perfectly round. To me that is the simple thing to do.
If that was a waste then maybe someone else can think of something else to check.
I have seen many people "do" the brakes but not even do a half way job.
#5
Sounds like warped rotors or our of round drums.
Hopefully you can find a good shop that can check them and resurface properly if needed. I had a shop warp a set of good original rotors for only 6 bucks apiece. They tried again and was only a little better. I gave up before they were trash.
Hopefully you can find a good shop that can check them and resurface properly if needed. I had a shop warp a set of good original rotors for only 6 bucks apiece. They tried again and was only a little better. I gave up before they were trash.
#8
If stock a 54 would be a drum car and it could be a out of round drum. You can check for lack of vacuum by pulling the vacuum line off the vacuum tank and listen for the rush of air sucking back in to the tank ( do this with the engine off). If no sucking sound look for a small hole in the tank or bad vacuum lines or a bad one way valve near the tank.If you don't know the tank is located It's on the drivers side along the frame rail You can't miss it it's about 4 inches in diameter and 24 inches long.....Tedd
#10
Thanks everyone. I guess I was not as clear as I should have been. All stock drums that are true and round. Ted I need to check the vacuum lines as that is the feeling the pedal is sending to me (LOL). Feels like a vacuum issue (pulse/bounce). I will let you guys know what I find this weekend.
#11
Your car decided to update itself to ABS, you should be happy A secondary shoe can hang up sometimes if not lubed and seated properly and cause a pulse every time it grabs and releases off the drum. x2 on looking for the simple stuff first that's mostly overlooked. When was the last time it got all the bake fluid flushed out?
#13
Is that January 10, of 2013 or January of 2010? I've seen drums warp that were brand new after driving through a puddle of water when they were hot. Have you checked them? I would assume nothing.
I may be wrong but I don't see this as a vacuum issue unless it does it standing still.
I may be wrong but I don't see this as a vacuum issue unless it does it standing still.
#14
#15
Sorry Eric. The frequency is the same everytime the pedal is depressed. It is not dependant on road conditions or engine speed.
@Oldcutlass. Yes January 2010. This started all at once not over time. One day it was fine and the next time I drove it is when I noticed it pulliing out of the garage. It does it at Idle when the car is not moving.
That's why I'm thinking vacuum and not the drums to start with as Ted suggested. Have not had the change to check it out at all yet. I will keep you all posted.
Terry
@Oldcutlass. Yes January 2010. This started all at once not over time. One day it was fine and the next time I drove it is when I noticed it pulliing out of the garage. It does it at Idle when the car is not moving.
That's why I'm thinking vacuum and not the drums to start with as Ted suggested. Have not had the change to check it out at all yet. I will keep you all posted.
Terry
#19
I know just enough about those systems to get in trouble. There are a few threads on the 2 systems. They are Delco Moraine and Bendix, I believe the master cylinder on a Delco Moraine has 4 attaching bolts on the booster with a square base, on the Bendix has 3 bolts with a triangular base.
Hopefully someone more familiar with these can help you out.
Hopefully someone more familiar with these can help you out.
#20
I've had my problems with treadle-vacs but never felt a pulsing as you describe. Mine ether worked or I got a hard peddle.If you can get the car up in the air look around the treadle- vac for any kind of brake fluid leak it doesn't take much to be a problem, also around the backing plates there might be a little fluid on on one of the brake linings. Let us know what you find out....Tedd
PS. when I lost a vacuum hose (vacuum hose came off) I just lost all power brakes. maybe if a small hole was in the tank it would pulse or if the valve were to go bad..Don't know...Tedd
PS. when I lost a vacuum hose (vacuum hose came off) I just lost all power brakes. maybe if a small hole was in the tank it would pulse or if the valve were to go bad..Don't know...Tedd
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